Spring Control of White Grubs on a Golf Course at Syracuse, Ny, 1985

Abstract

Abstract Nine insecticides were applied to a fairway at Onondaga C.C. on 29 Apr for control of Japanese beetle grubs. The fairway consisted of Kentucky bluegrass (75%), annual bluegrass (20%), and broadleaf weeds (5%). The experimental design was RCB with 4 replications. Individual plots were 10 ft × 10 ft. Thatch accumulation was ca. 0.5 inch compressed between the fingers. Granular materials were applied with a precalibrated Grandy 2G spreader. Liquid materials were premeasured in the laboratory and applications with 3 gal of water through a watering can. All liquid applications were made in two directions within each plot. At treatment time, the following environmental and soil conditions existed: air temperature 62°F; soil temperature (1 inch, 52°F; (3 inch, 50°F; soil type, sandy loam; soil pH, 6.5; water pH, 6.7; soil moisture, 15.2%. Pretreatment was 12.1 grubs per sq. ft. Posttreatment counts were taken 30 days later (29 May) by cutting a 1 × 10-ft strip lengthwise through each plot with a mechanical sod cutter (2.25-inch depth) and examining the sod and underlying soil for grubs. Species identifications were made in the field. Three samples were taken from each replicate, and mean surviving grubs determined per ft.